public class StringBufferDemo {

        public StringBuffer setBuffer() {
            StringBuffer buffer = new StringBuffer();
            buffer.append('j');
            buffer.append("kjxlkjc");
            System.out.println(buffer.charAt(1));
            System.out.println(buffer.length());
            System.out.println(buffer.capacity());
            System.out.println(buffer.indexOf("jx"));
            System.out.println(buffer.toString());
            return buffer;
        }
    }

